I was browsing DNSreport.com, and it mentioned (when I did a test on my domain name), "Reverse DNS entries for MX records." What doe sthis mean?

In theory, when your SMTP server sends an email, the receiving server will do a reverse lookup to ensure that it was really your server that sent the email. Its pretty much a check to see if you someone was trying to send fake/spam mail's.

It's a good thing to have RDNS setup for your mailserver IP's - but you may get away with out it.

It depends on the mail server software receiving the e-mail. Specifically, I believe qmail by default will reect e-mail from a mail server without a reverse DNS entry.

Is it possible to set that up through Cpanel or WHM?

Hi - just a point to make things clear... in a virtual hosting environment it is only the server IP that needs rDNS as that is where all the mail is sent from, web site IP's hosted in that virtual environment do not need rDNS.

HTH

YB

Originally posted by Gracklor
Is it possible to set that up through Cpanel or WHM?

Typically, your provider has to add the PTR record for your IP. You can usually just submit a support ticket to have this done.

The IP that the hostname of the server resolves to, should have a reverse DNS and is typically done by the DC